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Thread: Toilet Drain/Joist Clearance

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    DIY Member diydude's Avatar
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    Jul 2012
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    Default Toilet Drain/Joist Clearance

    Is there a minimum clearance requirement between a joist and a toilet drain opening? I read something about, I think, 3" from the center of the drain to a joist. I'd like to sister the bad joist in the attached pic. If my calculations are correct, doing this will leave me about 1/2" from the edge of a properly-centered 5" drain hole in the subfloor to the new sister.

    Thanks.
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